aS E Solar Surface aS/E Material Absorption Emissivity ratio Comments Reference Silver, Highly polished : 0.02 - 0.03: 3.00 : Marks (1) Gold, Highly polished : 0.02 - 0.04 This is related to their high damping constant, which leads to a short distance crossed by the light. References. Comments. It is defined as the fraction of energy being emitted relative to that emitted by a thermally black surface (a black body). A black body is a material that is a perfect emitter of … B 6, 4370-4379 (1972) Data [CSV - comma separated] [TXT - tab separated] [Full database record] Optical transmission calculator RESOURCES Metal Reflectivity Chart With metals, it is often desired to have a reflective surface-not necessarily blindingly bright but one that catches the eye. Room temperature. Emissivity is a measure of the efficiency in which a surface emits thermal energy. Reflecting materials - Light Reflectivity This table compares different aspects of potential reflectors for the Papasan Chair Solar Cooker: Material Reflectivity Weight Internet price quote Advantages Disadvantages Polished Anodized Aluminum ~95% Light ~$7/square foot Metals have high reflectivity, reflecting almost all wavelengths in the visible region of the spectrum. Our dedicated Reflectance Research Laboratory is equipped with over 25 of the major spectrometers and spectropho- Optical constants of the noble metals, Phys. Its relative reflectivity is much greater than surrounding surfaces. - 1 - Williamson Corporation, 70 Domino Drive, Concord, MA 01742 Phone: 978-369-9607, Fax 978-369-5485, Toll Free 800-300 -8367, E-Mail: sales@williamsonir.com Infrared Basics Infrared Energy, Emissivity, Reflection & Transmission Thermal Energy and Infrared Emission P. B. Johnson and R. W. Christy. A GUIDE TO REFLECTANCE COATINGS AND MATERIALS 3 INTRODUCTION Over the past 20 years, Labsphere has been involved with ongoing research to improve the state of the art in diffuse reflectance coatings and materials. Rev. Metallic Reflection. What is Emissivity?

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